Publish events calendar as iCalendar

[wleoncio]

Acting on a quick spin-off discussion on nordic-rse/nordic-rse.github.io#211 (review), I imagine many Nordic-RSE members would find it beneficial if the events listed on the bi-weekly agenda―or even all public NRSE events, as a matter of fact―were also available as a public, importable (e.g. .ics) calendar.

Proposing iCalendar as a format because it's the only format that comes to mind right now, but I guess whatever's most universal would be best.

[rantahar]

Just a comment on this repository: It was an experiment with pushing the agenda directly from HackMD to a github repository. However the actual agenda (at https://hackmd.io/@nordic-rse/biweekly) is accessible and clear enough, so we are not actually using this repository. I forgot to remove it, but it should be removed.

The idea itself is good. We could have a public calendar with all out public events (biweekly meetings and coffee break) on the website. That would make it easier for people to find them.